. >>> vatican intrigue, is there more to pope benedict's sudden decision to step down? and who might replace him? is there any chance the next pope could be an american? we're live in vatican city with new details. >>> and nightmare, passengers on a cruise chip stranded in the gulf of mexico say conditions are getting worse and there's word this morning that their journey will be even longer "today," tuesday, february 12th, 2013. >> announcer: from nbc news, this is "today" with matt lauer and savannah guthrie, live from studio 1a in rockefeller plaza. >>> morning, everyone. welcome to "today" on a tuesday morning. i'm savannah guthrie. >> and i'm matt lauer. important news breaking overnight. u.n. security council is going to hold an emergency meeting this morning to address north korea's overnight nuclear test. >> this is north korea's third nuclear test, but the first under its new leader, kim jong un. we'll have a live report from the pentagon straight ahead. >>> a big development in the story we've been following, two men now charged in connection with the murder o